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Sustainable Usage of Fly ash as Stabilizer in Rammed Earth Structures

Kosari Movahhed, Mohammad Hossein | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53252 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Toufigh, Vahab
  7. Abstract:
  8. Rammed earth (RE) is an eco-friendly building material and has been capturing special attention among researchers. Many of the recently studied RE additives are extremely resource- and energy-consuming. On the other hand, the usage of fly ash (FA), which is a sustainable replacement for cement, has been scarcely investigated in RE construction. In this paper, an experimental investigation was performed on the physical and mechanical properties of RE materials stabilized with the combination of cement and alkali-activated FA. This scrutiny consists of density measurements, pulse velocity tests, unconfined compression tests, and direct shear tests. Additionally, the carbon dioxide emission and unit cost of each mix were estimated using the available literature. Finally, a multi14 objective optimization was performed using the response surface method to determine the optimum mixture. The optimization goals were the maximization of strength parameters in addition to minimization of cost, density, and carbon footprint. Based on the optimization criteria, it was found that 0.7% of cement and 6.5% of FA was the suitable stabilizer choice for RE contractors
  9. Keywords:
  10. Stabilized Rammed Earth ; Multiobjective Optimization ; Cements ; Carbon Footprint Reduction ; Sustainable Construction ; Alkali-Activated Fly Ash ; Green Construction Materials

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